package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisConstants;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.concurrent.TimeUnit;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Autowired
    private StringRedisTemplate redisTemplate;
    @Override
    public Result queryTypeList() {
        //先从缓存查
        String key =  "cache:shopType:key" ;
        String jsonStr = redisTemplate.opsForValue().get(key);
        if(StrUtil.isNotBlank(jsonStr)){
            List<ShopType> shopTypes = JSONUtil.toList(jsonStr, ShopType.class);
            return Result.ok(shopTypes);

        }

        //查询数据库 在写入缓存
        List<ShopType> shopTypes = query().orderByAsc("sort").list();
         jsonStr = JSONUtil.toJsonStr(shopTypes);
        redisTemplate.opsForValue().set(key,jsonStr, RedisConstants.CACHE_SHOP_TTL, TimeUnit.HOURS);

        return Result.ok(shopTypes);
    }
}
